Update README.md

Improve whiteboard diagram quality

above-the-fold board: header:mini + compact chalk header; field notes article linked

v2: teacher's-studio design, MiniCPM5 planner+coach, expanding board, field notes

README: full Well-Tuned scorecard — two artists, live A/B, honest retirement

README: honest planner-fallback note (ZeroGPU Mamba prefill constraint)

README: Well-Tuned badge — published board-artist LoRA + dataset, honest flag-off story

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initial commit